CWT stands for "centum weight," which is another term for "hundredweight." Certain thin materials like sheet metal are sold by the CWT, which is the cost of the unit per 100 pounds. If you want to calculate the sheet cost by centum weight, all you have to do is look up a few properties about the type of sheet-based material you are trying to buy.
Find the total weight of all the sheet-based products you want to buy. If you need 300 sheets of metal, for example, and each sheet weights 5 pounds, 300 x 5 = 1,500 pounds.
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Divide the total number of pounds by 100 to find the CWT or "hundredweight" of the sheets you need to buy. For example, 1,500 pounds divided by 100 equals 15 CWT.
Divide the total cost of your sheets by the number of CWT you calculated to find the cost per CWT. For example, if your 300 sheets cost $15,000, this means that $15,000 divided by 15 CWT equals a cost of $1,000 per CWT.